Last name Sinma (Sinma 
, สินมา ) , in all the world, is quite a rare family name. The last name Sinma is habitual in South-eastern Asia, particularly Thailand, where it is quite a rare surname, Myanmar, where it is a rare surname, and Malaysia, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in South-eastern Asia, particularly Thailand, Myanmar, and Indonesia. Very seldom, Sinma is the forename as well as the last name.